Provided is a method for enrichment of GABA in a grain, which is capable of more suitably obtaining the enzymatic action of glutamic acid decarboxylase when adding vinegar or glutamic acid to the grain. A vinegar addition step of adding vinegar in an amount of 1.0-6.0 percent added to the grain in a weight ratio; and a storage step of storing the grain to which the vinegar has been added at 50 dege Scientific grade or more for 3 hours or more. Figure 3

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